segmentedControl 和 UIAppearance 代理的图形问题

Question

我有一个在 titleBar 中带有 segmentedControl 的应用程序，它用于在 3 个导航 Controller 之间切换。我正在使用新的外观代理方法来设置此 segmentedControl 的样式(下面的代码)。但是，似乎存在某种我无法弄清楚的错误。当我深入其中一个导航 Controller 然后导航回根目录(然后再次在顶部栏中显示 segmentedControl)时，它就会出现。当发生这种情况时，分隔线图形会变得困惑，如您在屏幕截图中所见(第一个显示它应该看起来的样子)。

有没有人遇到过类似的事情并且知道如何解决？

我设置外观的代码是:

  UIImage *segmentSelected            = [[UIImage imageNamed:@"sel"]      resizableImageWithCapInsets:UIEdgeInsetsMake(0, 6, 0, 6)];
UIImage *segmentUnselected          = [[UIImage imageNamed:@"uns"]      resizableImageWithCapInsets:UIEdgeInsetsMake(0, 3, 0, 3)];
UIImage *segmentSelectedUnselected  = [[UIImage imageNamed:@"sel-uns"]  resizableImageWithCapInsets:UIEdgeInsetsMake(0, 6, 0, 6)];
UIImage *segUnselectedSelected      = [[UIImage imageNamed:@"uns-sel"]  resizableImageWithCapInsets:UIEdgeInsetsMake(0, 6, 0, 6)];
UIImage *segmentUnselectedUnselected = [[UIImage imageNamed:@"uns-uns"]  resizableImageWithCapInsets:UIEdgeInsetsMake(0, 6, 0, 6)];

[[UISegmentedControl appearanceWhenContainedIn:[UINavigationBar class], nil] 
      setBackgroundImage:segmentUnselected forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearanceWhenContainedIn:[UINavigationBar class], nil] 
      setBackgroundImage:segmentSelected forState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearanceWhenContainedIn:[UINavigationBar class], nil] 
      setDividerImage:segmentUnselectedUnselected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearanceWhenContainedIn:[UINavigationBar class], nil] 
      setDividerImage:segmentSelectedUnselected forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearanceWhenContainedIn:[UINavigationBar class], nil] 
      setDividerImage:segUnselectedSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearanceWhenContainedIn:[UINavigationBar class], nil] 
      setContentPositionAdjustment:UIOffsetMake(8, 0) forSegmentType:UISegmentedControlSegmentLeft barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearanceWhenContainedIn:[UINavigationBar class], nil] 
      setContentPositionAdjustment:UIOffsetMake(-8, 0) forSegmentType:UISegmentedControlSegmentRight barMetrics:UIBarMetricsDefault];

它应该是什么样子:

它看起来像什么:

Answer 1

我通过外观为 UINavigatorBar 使用了 backgroundImage，并注意到将这种方法与 UISplitViewController/UIPopoverController 一起用于整个导航栏被移动到内容区域。所以你只看到深蓝色边框，自定义导航栏位于边框正下方，看起来很奇怪。

对您没有帮助，但这可能是一个真正的错误？!